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You can think of computer memory as a long continuous strip. The strip is composed of millions sometimes billions of slots. Each slot has a unique identifying value called its address. Windows moves data onto and off of this strip as required.
For instance, running an executable file from a disk causes Windows to copy the file from the disk to memory and then run the executable from there. One principle of memory design is known as Spatial Locality. It says that memory addresses which are near each other tend to be referenced close together in time.
Memory is designed with this principle in mind and so, we should expect to see a decline in memory access time if we continually request addresses that are far apart from each other.
First, it runs through the block of memory sequentially, accessing every value. Next it runs through the same block again, except this time it accesses every second value.
On this occasion, it runs through the block twice in order to access the same amount of data as the initial step. Next it runs through the same block again, except this time it accesses every fourth value and so makes four passes. And so on, until a certain maximum step size is reached. The size of the block of memory used for this test is one quarter the amount of system RAM or MB, whichever is smaller.
Memory Speed Per Block Size When a computer program wants to use a section of memory to store data, it makes a request to Windows for the amount of memory it requires. Windows allocates the memory to the program unless system resources are very low and returns to the requesting program the address of the first memory slot in the allocated block.
It is possible that some programs may request very large amounts of memory. During each step of the test, PerformanceTest requests a block of memory and runs through the block measuring the access speed.
However on each subsequent step the size of the requested memory is increased, until finally a block close to the size of the system RAM is requested. In this way it is possible to observe the different access speeds for the different sizes of blocks. Typically it is possible to see a drop in speed when the block no longer fits in level 1 cache, then again when it no longer fits in level 2 cache and goes back to main memory.
In the case where system resources are low, swapping to the disk may even be required for very large blocks.Considerations for Testing All-Flash Array Performance What you need to know when evaluating the performance of Solid State Storage Systems.
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In the memory write operation after the address is loaded the CPU sends the write control signal followed by the data to the requested memory location.
The memory can be classified in various ways i.e. based on the location, power – Write Ability – Storage Performance Write ability. Khronos makes no, and expressly disclaims any, representations or warranties, express or implied, regarding this Specification, including, without limitation: merchantability, fitness for a particular purpose, non-infringement of any intellectual property, correctness, accuracy, completeness, timeliness, and .
This chapter discusses monitoring and tuning Oracle Exadata System Software. Oracle provides utilities for most monitoring tasks in the Oracle Oracle Exadata Storage Server environment.